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drivers: cpuidle: Add idle-state-name description to ARM idle states

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On ARM machines, where generally speaking the idle state numbering has
no fixed and standard meaning it is useful to provide a description
of the idle state inner workings for benchmarking and monitoring purposes.

This patch adds a property to the idle states bindings that if present
gives platform firmware a means of describing the idle state and export
the string description to user space.

The patch updates the DT parsing code accordingly to take the description,
if present, into consideration.

Acked-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Lorenzo Pieralisi 2014-10-15 16:57:34 +01:00 committed by Daniel Lezcano
parent 97735da074
commit c00bc5df7c
2 changed files with 12 additions and 1 deletions
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6
Documentation/devicetree/bindings/arm/idle-states.txt
View File

@ -331,6 +331,12 @@ follows:
If the property is not present the idle-state must
be considered operational.
- idle-state-name:
Usage: Optional
Value type: <string>
Definition: A string used as a descriptive name for the idle
state.
In addition to the properties listed above, a state node may require
additional properties specifics to the entry-method defined in the
idle-states node, please refer to the entry-method bindings

7
drivers/cpuidle/dt_idle_states.c
View File

@ -27,6 +27,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
{
int err;
const struct of_device_id *match_id;
const char *desc;
match_id = of_match_node(matches, state_node);
if (!match_id)
@ -73,6 +74,10 @@ static int init_state_node(struct cpuidle_state *idle_state,
return -EINVAL;
}
err = of_property_read_string(state_node, "idle-state-name", &desc);
if (err)
desc = state_node->name;
idle_state->flags = CPUIDLE_FLAG_TIME_VALID;
if (of_property_read_bool(state_node, "local-timer-stop"))
idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;
@ -82,7 +87,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
* and desc become string pointers
*/
strncpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN - 1);
strncpy(idle_state->desc, state_node->name, CPUIDLE_DESC_LEN - 1);
strncpy(idle_state->desc, desc, CPUIDLE_DESC_LEN - 1);
return 0;
}